The CAS Registry Mumber 951891-50-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,5,1,8,9 and 1 respectively; the second part has 2 digits, 5 and 0 respectively. Calculate Digit Verification of CAS Registry Number 951891-50: (8*9)+(7*5)+(6*1)+(5*8)+(4*9)+(3*1)+(2*5)+(1*0)=202 202 % 10 = 2 So 951891-50-2 is a valid CAS Registry Number.
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